[Outstanding Performance] - Our aid steering wheel knob can rotate 360 degrees smoothly, which gives you full control of the wheel to keep you safe at all time, makes your operation more stable, labor-saving and , specially suitable for any vessel where fast turning maneuvers needed. [Premium Materials] - steering wheel Maneuvering knob is made of 316 stainless steel, anti-rust, sturdy and anti-erosion, so it extends the service life about 5 years. [Widely Used ] - The marine steering spinner fits most oval steering wheels tube with rim diameter from 0.75 inch to 0.98 inch (If your wheel is round stock, you could reshaped the lower piece slightly with two pairs of pliers). [Professional Design] - Design for human palm, soft , spheroid shape provide enough grip while maneuver wheel. Bearing knob allows to maneuver the steering wheel quickly. [Easy to Install] - 1 Marine Boat Steering Wheel Knob and 1 Wrench. Equipped with a wrench to Lock nut and use the wrench to tighten the knob to attaches to boat steering wheels, fast installation, Colour:silver Material:316 stainless steel Package Contents: 1 x Marine Boat Steering Wheel Knob 1 x Wrench Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.